"We have to act. We have an obligation to make sure that the legacy of those children who were killed is honored."

The Democrats, who staged a sit-in on the House floor beginning Wednesday, plan to hold the floor until they get a vote, she said.

"It is a cowardly act that they have not at least allowed a vote," she said.

"We will continue to shine a spotlight on this issue, the fact that the Republicans in the majority will not allow a vote on bills that would simply say, 'If you are suspected of terrorism. If you are on the terrorist watch list, if you are on the no fly list in this country, then you should not be able to buy a gun.' "

Republicans can vote however they want on the legislation, she said, but they need to hold a vote.

"They need to do their jobs and face the music," she said, "and stop cowering in the corner because of their fear of the NRA and their retribution."